From the video it appears to me that you were still in the process of changing lanes, so if it reached court then a few % of the responsibility may end up with you since you are supposed to ensure that your lane changes are safe and won’t result in an accident. As an insurance matter there is no issue, it was 100% the other drivers fault. Since it was on a roundabout I doubt that a judge would give you more than slight criticism anyway, but never treat dashcam video as 100% proof that your view is correct in court, and do treat it as a learning opportunity. Different people will see different stories in it, so worth getting a few opinions.
That is quite a bit of damage, but should be repairable unless there is something big hidden.